package com.atguigu.gulimall.gulimallcart.interceptor;

import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.constant.CartConstant;
import com.atguigu.common.vo.MemberRsepVo;
import com.atguigu.gulimall.gulimallcart.vo.UserInfoTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/***
 *
 *
 */
@Component
public class CartInterceptor implements HandlerInterceptor {

    //
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    /**
     *
     * 业务方法执行之前
     *
     * */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        UserInfoTo userInfoTo = new UserInfoTo();
        MemberRsepVo memberRsepVo = (MemberRsepVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (memberRsepVo != null) {
            //登录
            userInfoTo.setUserId(memberRsepVo.getId());
        }
            Cookie[] cookies = request.getCookies();
            //
            if (cookies != null && cookies.length > 0) {
                for (Cookie cookie : cookies) {
                    String name = cookie.getName();
                    if (name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                        userInfoTo.setUserKey(cookie.getValue());
                        userInfoTo.setTempUser(true);
                    }
                }
            }
            //如果没有临时用户，分配一个临时用户
            if (StringUtils.isEmpty(userInfoTo.getUserKey())){
                userInfoTo.setUserKey(UUID.randomUUID().toString());
            }
        threadLocal.set(userInfoTo);
        return true;
    }
/**
 *
 * 业务执行之后
 *
 * */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

        String userKey = threadLocal.get().getUserKey();
        //如果没有临时用户，分配一个key
        if(!threadLocal.get().isTempUser()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME,userKey);
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);//设置临时用户
        }


    }
}
